// The MIT License (MIT)
//
// Copyright (c) 2017 - 2019 zqqf16
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

import Foundation
import Cocoa

class FileFinder {
    var observer: AnyObject?
    var query = NSMetadataQuery()
    
    var isRunning: Bool {
        return self.query.isGathering
    }
    
    func search(_ condition: String, completion: @escaping ([NSMetadataItem]?)->Void) {
        query.predicate = NSPredicate(fromMetadataQueryString: condition)
        
        self.observer = NotificationCenter.default.addObserver(forName: .NSMetadataQueryDidFinishGathering, object: nil, queue: nil) { (notification) in
            self.query.stop()
            if let observer = self.observer {
                NotificationCenter.default.removeObserver(observer)
                self.observer = nil
            }
            
            let result = self.query.results as! [NSMetadataItem]
            completion(result)
        }
        
        query.start()
    }
}
